Delay- and Packet-Disordering-Dependent H∞ Output Tracking Control for Networked Control Systems

This paper is concerned with the problem of H output tracking control for networked control systems (NCSs) with network-induced delay and packet disordering. Different from the results in existing literature, the controller design in this paper is both delay- and packet-disordering-dependent. Based on the different cases of consecutive predictions, the networked output tracking system is modeled into a switched system. Moreover, by the corresponding switching-based Lyapunov functional approach, a linear matrix inequality (LMI)-based procedure is proposed for designing state-feedback controllers, which guarantees that the output of the closed-loop NCSs tracks the output of a given reference model well in the H sense. In addition, the proposed method can be applied variously due to all kinds of prediction numbers of the consecutive disordering packet have been considered, and the designed controller is based on the prediction case in the last transmission interval, which brings about less conservatism. Finally numerical examples and simulations are used to illustrate the effectiveness and validity of the proposed switching-based method and the delay- and packet-disordering-dependent H output tracking controller design.